I am waiting to use the teoz rendering for oneline activities.
In the meanwhile I tested the feature and found several issues.
The test is build from source of https://github.com/plantuml/plantuml 36c461da (master/tag: v1.2019.12).
Reproduction sequence for two page diagram:
'!pragma teoz true
1. 1st page: Notice misalignment of arrow to activation and deactivation.
2. 1st page: Notice that the "----" page separation is missing.
2. 2nd page: Notice that the "----" page separation is missing.
3. 2nd page: Notice activations of first page are rendered.